Pro Git, Scott Chacon and Ben Straub, 2014 (Apress) - The official, comprehensive guide to Git, covering its history, distributed nature, and core concepts. Freely available online.
Version Control (Git) - The Missing Semester of Your CS Education, Anish Athalye, Jon Gjengset, Jose Javier Gonzalez Ortiz, Irena Huang, and Sanjana Wason, 2024 (MIT Computer Science and Artificial Intelligence Laboratory) - A practical introduction to Git from a foundational computer science perspective, explaining its distributed nature and common workflows.